Malicious PDF — malware analysis report

Static analysis result for SHA-256 091d2f3bc0c9ff81…

MALICIOUS

PDF

120.5 KB Created: 2021-07-26 10:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a4ad9ba29735b863a1203651aaa9a486 SHA-1: e3dca6e78ff34bb493af232e421727a02e25ce44 SHA-256: 091d2f3bc0c9ff8147734c2c7f4040c55e6e468a2ffd78a9540ad90fb556dbae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious URLs, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/i541oqshih39iqfm191dp93vqc/kamulugo.pdf In PDF document text
    • http://demkapi.com/resimler/files/rupivutidofi.pdfIn PDF document text
    • https://chp-travel.ir/data/file/bijevonijid.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/xakominubekusada.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/124967ce4e65c0550b04c4dd881aadee/11258593553.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/zimugonuxefanowikakevu.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/a0864a72bcc2c57894aa3067f478d163/lejarilutalubigoti.pdfIn PDF document text
    • https://puppometalli.eu/file/sirolabimomivagumezudaw.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/fetoxafadedenowevaki.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c378e590cb6---turimoletaxupawokoz.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/kegakuwatedevevozafepafu.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/767c588889ca76bbe5c30b878ecff6af/52870488788.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/kupudidezimum.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/k1f7lvmjnrr7l1q6f35d3h0rvv/34086775145.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/56113153337.pdfIn PDF document text
    • http://gdaniec.com/upload/files/kadasifupuzadifaki.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d682ee77c53---tapojesulujo.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/9v67l73ku6ve9m9ofntvpgj9ko/60840071541.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/11673441649.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f9cabfae3---morafopopokowiva.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160affa7944cb1---kunemebogazupufa.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/18358aed44826c4332b84dbf6f3b36c5/10468501260.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ichtmb3cf6kdils4d3ki3lgtdh/jexigizapif.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/12591885a9d207fede1efc420d2a3cda/wuwovif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=plan+municipal+de+desarrollo+urbano+ecatepec+2020PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E40 11160 bytes
SHA-256: caea78910c7cdd67d0c3db9cce2b60b5bc5fda53337d5810af12e6ff9ef71653
font_01_sfnt_off0001881b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1881B 19432 bytes
SHA-256: 2cb125bbe09bccd19fb7a578a2aca65384ac3e4b27da9d981fcdbd3c2742b9ed
font_02_sfnt_off0001b9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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